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Specific yield for an unconfined aquifer is...

Specific yield for an unconfined aquifer is ________________

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+1 vote

asked Sep 26, 2023 in Irrigation Engineering by Carter (75.2k points)

Specific yield for an unconfined aquifer is ________________

(a) greater than porosity

(b) less than porosity

(c) equal to porosity

(d) unrelated to porosity

This question was addressed to me during a job interview.

The doubt is from Aquifers and Their Type-2 topic in portion Ground Water for Irrigation through Wells and Tubewells of Irrigation Engineering

irrigation engineering
ground water for irrigation through wells and tubewells
aquifers and their type-2

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1 Answer

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answered Nov 9, 2023 by Greg (106k points)

The correct option is (b) less than porosity

For explanation I would say: The specific yield is expressed as the ratio of the volume of the water obtained by gravity drainage to the total volume of the material drained. Since, Specific yield + Specific retention = Porosity. Evidently, the specific yield is less than the porosity.

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